Jack



1.10. KOPF.

JACK.

APPLIVCATION FlLED0CT-24,19I9.

1,337,523 19. Patented Apr. 20, 1920.

4 SHEETS-SHEET I.

IN l/E IV TOR ATTORNEY C. KOPF,

JACK.

APPLICATION, FILED OCT. 24, 1919.

Pat-emt Apr. 20, 192%,

4 SHEETS-SHEET 2.

4% Fig.2.

I v 2 ZTTORA/EY 7 J. G. KOPF.

lACK.

APPLICATION FILED. OCT- 24, 1919.

4 SHEETS-SHEET 3.

v1,: ,':3 7,519. Patented Aim 20, 1920.

lNl/E T05 F. 7 2 r ATTORNEY 2. C. KOPF.

JACK.

APPLICATION, FILED 001-24, 1919.

Patanted Apr. 26, E

I 4 SHEETS-SHEET i 2 1 .il 5 8 7 5 0 5 3 9 l l spiral pinion is operated dir i ne i v if ir dium enri JOHN C. KOPF, GE EELLEV UE BQKGUGI-I, PENNSYLVANIA, ASSIGNGB TO THE DUFF MANUFAGTURING COMPANY, 033 PENI'J'SYLVANI A TION OF .PENNSYLVANIA.

A consona- JACK.

Application filed ()ctober 24, 1919.

To all whom a may concern Be it known hat 1, JOHN G. Kerr, a c1tizen of the United States, and resident of the borough of Bellevue, in the county of Allegheny and State of Pennsylvania, have invented new and useful Jack, of which the following is a specification.

The invention relates to jacks or the like, and has for its object to provide a jack which siall be comparatively simple, light, compact, efficient, and easy to produce. Specifically the present invention is an improvement or modification upon and within the kind of jack disclosed in my Patent No. 1,317,878, dated October 7, 1919, wherein a double rack with twin pinions are operated by a double conical or convex spiral pinion meshing beween a pair of buttress-toothed gears, the working faces of the spiral pinion having a. major spiral pitch and a minor helical pitch and e: ting power through line contact upon series of teeth on the concrging arcs of the buttress gears. substan tially at right angles to the axis of rotation of the pinion. In the particular embodi ment illustrated in said patent, the double ly by reciprocating ratchethandle on its shaft. In the construction herein disclosed the double spiral pinion has a central gear portion, which is driven by apinion on a central upwardly inclined This affords a further multiplication of power, permits an in: crease in the diameter of the rack pinions and a decrease in the size of the buttress gears, with corresponding alteration in the frame and easing, whereby greater lightness and compactness are secured, and makes possible certain economies in manufacture. Furthermore the advantage of distance operation without stooping, by a long rotary handle, is secured.

In the accompanying drawings, forming a part hereof:

Figure 1 is a side elevation of the jack, with the intermediate portion of its handle broken away for economy of space;

Fig. 2 is a central vertical section in a fore and aft plane;

Fig. 3 is a front elevation with the cover removed, and the double spiral pinion memher in section;

Fig. 4 is a horizontal cross-section on the line 4-4 of Fig. 2;

Specification of Letters Patent.

Serial No. 332,867.

Fig. 5 is a horizontal cross-section on the line 5-5 of Fig. 2;

Fig. 6 is a horizontal modification; and

7 is an elevation of portion of the round neck of Fig. 6.

The device has a frame or stand 1, with a suitable base 2. in the stand is a vertical guide chamber for a rack-bar d, having a head r and if desired a depending external toe-lift 5. The opposite sides of this rackbar are preferably channeled, and in these channels are the rack teeth 6.

in rear pinion chambers 7 in the upper part of the stand twin pinions 8 mesh with the recessed sides of the rack. aid rackpinions are mounted. on parallel shafts 9 at opposite sides of the rack, journaled in fixed front and rear bearings 10 and 11 in the frame, the front bearings being supported by suitable walls or webs 12 between the rack-pinion chambers and a front chamber 13, which is provided with a front cover 1 1 detachably secured by screws 15.

Fast on the forward ends of said shafts within the chamber 13 are gears 16 having reversely disposed straight buttress teeth 17, that is to say, triangular teeth the backs of which are sloped, and the working faces approximately perpendicular and parallel with the axis from front to back. Said gears are meshed simultaneously by a double spiral pinion 18, comprising a disk mounted on a transverse axis below the gears and having convex or broadly conical sides projecting upward between the lower, converging arcs of the gears. Said sides are formed each with a spiral working face 19, having section showing a a constantly varying major spiral or radial pitch, a constantly varymg minor helical pitch, and a constantly varying angle, whereby in lifting the pinion acts with line contact upon two or more teeth on each in the upward direction, substantially at right angles to the transverse axis of the pinion, all as set forth more particularly in my patent aforesaid.

The double spiral pinion 18 is supported loosely upon the center of a transverse idle shaft 20, which is mounted loosely in closed, laterally-spaced journal bearings 21 carried by the internal walls of the body of the stand. In assembling, said shaft is inserted endwise through the bearings and pinion,

' device will be readilyunderstood.

and when in place is held against coming tion, consisting of worm gear teeth 23 cut on the periphery of tee member in position to clear the teeth of the buttress-gears.

Said gear is meshed by worm or driving pinion "2 L below the member 18, the axis of this pinion lying substantially in the oeutral plane normal to the transverse axis of the compound double-pinion and member, and being inclined upwardly and forwardly. The rear, lower journal or shaft end 25 of said worm is rotatably supported in a bearing 26 in the body of the stamil and its upper, forward journal 2? is similarly supported in a bonnet bearing .28 in the cover 14. A projecting shaft end 29 is provided with a cross-pin 30, whereby it is adapted to receive the slotted sot/net end 3 of a removable long rotary crank handle 32, by means of which the jack can be operated. by a person in a standing position.

The pinion 2d and constitute a multiplying driving means for the double spiral pinion, which as heretofore stated makes it possible to increase the size of the rack-pinions 8 and decrease that of the buttress-gears 16 From this a smaller and less projecting inclosure at the upper end of the standard results; and the a )plication of external power through the rotar handle at a lower, central region also makes for compactness and greater stabilit lihe reaction of the worm 24; and worm gear teeth as produces some lateral or axial thrust upon the double spiral pinion member 18, which is taken up by the confinement of the member between the bearings 21.

The projection of the rack-pinions 8 into the channeled toothed sides of the rack-bar 4rcontributes to the lateral compactness of the organization. It is also possible to construct and assemble said pinions in an inexpensive manner by making them of a plurality of separate punched-out laminations 33 which are held together simply by being strung on angular or keying portions 3-42; of the shafts 9, between shoulders on said shafts and side-bearings 36 on the bat-l of the frame. At the working regions, the teeth of the laminated pinions are confined by the side flanges 37 of the rack channels. The thin toothed disks composing the pinions are introduced into the pinion ehai bers by way of the rack channel 3, through an opening 38 from the front chamber 18.

From the foregoing and in connection with my prior patent, the operation of the While the preferred embodiment has been described in detail, it will be understood that numerous changes may be made without departing from the matters of novelty herein contained.

Figs. 6 and 7 illustrate the fact that a round'racl'r l having teeth G extending circumferentially' around it may be employed. Such raclr is free to turn, presenting fresh portions of its teeth to the engagement of the pinions 8, whereby the life of the rat-l: is prolonged.

What I claim as new is:

1. A jack comprising a frame, a double rack-bar therein, pinions meshing the rackbar at opposite sides, a pair of gears connected with the rack-pinions and having buttress teeth reversely disposed, a double spiral pinion on a transverse projecting in meshing engagement between said but tress gears, the working faces of the spiral pinion having major spiral pitch and a minor helical pitch and adapted to exert power upon series of teeth on the converging arcs of the buttress gears substantiall 1 at right angles to the transverse axis, in combination with a gear on the middle of said double spiral pinion, and a driving pinion meshing with said gear.

2. jack comprising a frame, a double -bar therein, pinions meshing the rackbar at opposite sides, a pair of gears connected with the raclI-pinions and having buttress teeth reversely disposed, a double spiral pinion on transverse axis projecting in meshing engagement between said buttress gears, the working faces of the spiral pinion having a major s1 iral pitch and minor helical pitch and adapted to exert power upon series f teeth on the converging arcs of the buttress gears substantially at right angles to the t *ansverse axis, in combination with a gear on tne middle of said double spiral pinion, and drivin means meshing with said gear, the axis or said driving means lying substantially in the central plane normal to the transverse axis of the double spiral pinion.

3. A jack comprising a frame, a double rack-bartherein, pinions meshingthe rackbar at opposite sides, a pair of gears connected with the raok-pinions and having buttress teeth reversely disposed, a double spiral pinion on a transverse axis projecting in meshing engagement between said buttress gears, the working faces of the spiral pinion having a major spiral pitch and a minor helical pitch and adapted to exert power upon series of teeth on the converging arcs of the buttress gears substantially at right angles to the transverse axis, in combination with worm wheel teeth on the central periphery of the double spiral pinion clear of the buttress gears, and a central driving worm.meshing with said teeth.

4:. A jack comprising a stand, a double rack-bar therein, pinions meshing the rackbar at opposite sides, a pair of gears connected with the rack-pinions and having buttress teeth reversely disposed, a double spiral pinion on a transverse aXis below said gears and projecting in meshing engagement between the same, the working faces of the spiral pinion having a major spiral pitch and a minor helical pitch and adapted to exert power upward upon series of teeth on the converging arcs of the buttress gears, in combination with a gear on the middle of said double spiral pinion, and driving means meshing with the lower part of said gear, the axis of said driving means lying at an upward inclination substan tially in the central plane normal to the transverse axis of the double spiral pinion.

5. In a device of the character described, the combination with a frame, a double rack-bar therein, pinions meshing the rackbar at opposite sides, and a pair of gears connected with said rack-pinions, of a compound gear member mounted on a transverse axis and projecting between said gears, said gear-member having lateral pinion portions meshing said gears and a central gear portion clear of the same, and driving means meshing said central gear portion.

6. In. a jack, the combination with a frame, a double rack-bar therein, pinions meshing the rackbar at opposite sides, and a pair of gears connected with said pinions, of bearings in the frame, a supporting shaft loose in said bearings, a compound gear-member loose on said shaft between said bearings and projecting between said gears, said gear-member having lateral spiral pinion portions meshing with said gears and a central gear portion clear of the same, and driving means meshing said central gear portion.

7. In a jack, the combination with a frame, a double rack-bar therein, pinions meshing the rack-bar at opposite sides, and a pair of gears connected with said pinions, of bearings in the frame, a supporting shaft loose in said bearings, a compound gearmember loose on said shaft between said bearings and projecting between said gears, said gearmember having lateral spiral pinion portions meshing with said gears and a central gear portion clear of the same, driving means meshing said central gear portion, and a cover formed to retain the loose shaft against endwise displacement.

8. A jack, comprising a frame, a double rack-bar therein, said rack-bar having its rack-teeth sides recessed, a pair of pinions engaging in said recessed sides, a pair of j buttress gears united with said pinions, a double spiral pinion on a transverse axis projecting in meshing relation between said buttress gears and having a central gear portion clear of the same, and a driving pinion meshing said central gear portion.

9, A jack, comprising a frame, a double raclebar therein, said rack-bar having its rack teeth sides recessed, a pair of shafts at opposite sides of the rack-bar, a pair of pinions on said shafts engaging in said recessed sides of the rack-bar, said pinions being composed of separate laminations keyed on said shafts and confined by the recesses of the rack-bar, a pair of buttress gears on said shafts, a double spiral pinion on a transverse aXis projecting in meshing relation between said buttress gears and having a central gear portion clear of the same, and a driving pinion meshing said central gear portion.

JOHN C. KOPF. 

